For Raspberry Pi GPIO Expansion Extension Board Screw Terminal Hat for Raspberry Pi 2B/3B/3B+/4B/Zero/Zero W. Fine Terminal Pinout - There is the pin-out information of the GPIO pin on the top of the terminal and on the side. Observe GPIO Status - The status information of the pin will be displayed. When the GPIO pin in the terminal is powered and effective, the LED matrix on the right side of the terminal shows the status of the GPIO pin, and some differences are made in the color of the LED lights. EASY TO INSTALL - This is a very nice screw terminal extension version that expands for the pins of the Raspberry Pi. Our Raspberry Pi hat is practical for anyone to do electronic experiments. LED indicators in different colors - for example, the 5V power light is red, while the 3.3V power light is pink, the light of the special function pin is dark blue, and the indicator light of the GPIO pin is light blue. Legal Disclaimer: 1- This is not a brand name product, it is a high quality compatible with Arduino products. 2- Logos or Text on chips or board color may differ than pictures. 3- Please allow slight dimension difference due to different manual measurement.